Uniform Circular Motion

A car rounds a horizontal curve of constant radius at a constant speed. Which diagram best represents the directions of both the car's velocity (v) and acceleration (a)?

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A 1.00 x 10³ kg car is driven clockwise around a flat circular track of radius 25.0 m. The speed of the car is a constant 5.00 m/s. At the instant shown in the diagram, the car's centripetal acceleration is directed ______.

• toward E

• toward N

• toward W

• clockwise

The position vector of the car moving in a circular path in the diagram is directed towards the ___________

• East

• South

• West

• North

The car in the diagram is moving at a constant velocity in a circular path due to the friction between the tires and the track. If the circular track were to suddenly become frictionless at the instant shown in the diagram, the car's direction of travel would be _____.

• toward E

• toward W

• toward N

• clockwise

Which of the following is the unit for tangential velocity?

• m/s²

• m/s

• m²/s²

• m

The quotient between the circumference of a circle and the period of revolution is the _______________.

• centripetal force

• net force

• centripetal acceleration

• tangential velocity

A ball rolls through a hollow semicircular tube lying flat on a horizontal table top. Which diagram best shows the path of the ball after emerging from the tube as viewed from above.

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The 2.0 kg cart in the diagram is traveling at a constant speed in a horizontal circle of radius 3.0 m. The magnitude of the centripetal force on the cart is 24 N. In the position shown, the acceleration of the cart is _____.

• 8.0 m/s² directed toward point A

• 12.0 m/s² directed toward point A

• 8.0 m/s² directed toward point D

• 12 m/s² directed toward point D

A 1.00 x 10³ kg car is driven clockwise around a flat circular track of radius 25.0 m. The speed of the car is a constant 5.00 m/s. What would the centripetal force on the car be?

• 1.00 x 10³ kg

• 1.00 x 10³ N

• 1.00 x 10³ m/s²

• 1.00 x 10³ m

The direction of the velocity of objects moving in a circular path is ________.

• away from the circular path

• tangent to the circular path

• towards the center of the circular path

• downward